Kayaba Industry Company, Ltd.

Nec Corporation

Noboru Shimizu

Naoto Shima

Masashi Takai

Tsunefumi Arita

Norimasa Amano

Fumihide Kozuma

Hideyasu Ihira

Tsunofumi Arita

Hisashi Tsuda

A steering speed-computing section () to differentiate a steering angle of a steering wheel from a steering angle sensor () to compute the steering speed signal, a low-pass filter () to cut high frequency components in the steering speed signal to output a correction steering speed signal, a switching section () to switch the cut-off frequency in the low-pass filter to be higher at the time of determining a high-speed steering condition, and a flow quantity-computing section () to compute a target flow quantity supplied to a power steering output section () based on the steering angle signal and the correction steering speed signal are provided to control a flow quantity of an operating oil supplied to the power steering output section () for the target flow quantity.

Power steering system

A power steering system capable of giving a driver no discomfort even when an incoming current instruction value sharply decreases. The power steering system comprises a controller C for determining a solenoid current instruction value SI on the basis of a current instruction value Iin accordance with a steering angle supplied from a steering angle sensor, a current instruction value Iin accordance with a steering angular velocity, and a current instruction value in accordance with a vehicle speed. The controller C comprises a delay control section for reducing the rate of decrease only when the incoming current instruction value sharply decreases and outputting the resulting current instruction value.

Provision of a power steering system capable of giving a driver no discomfort during high-speed travel. A controller calculates or stores a current instruction value Iin accordance with a steering angle supplied from a steering angle sensor and a current instruction value Iin accordance with a steering angular velocity; performs multiplication of the steering angle base current instruction value Iand the steering angular velocity base current instruction value Iby current instruction values IIset based on a vehicle speed, respectively; applies current instruction values IIin accordance with the vehicle speed serving as limit values to the corresponding steering angle base and steering angular velocity base current instruction values resulting from the multiplication; selects a larger value of the two current instruction values below the limit values; and determines the selected value as a solenoid current instruction value SI.

A power steering system capable of preventing an unnecessary standby flow produced in high speed travel. A controller C determines a basic current instruction value Id based on a current instruction value I1 in accordance with a steering angle detected by a steering angle sensor, a current instruction value Iin accordance with a steering angular velocity and current instruction values I, Iin accordance with a vehicle speed, and adds a standby current instruction value Is to the basic current instruction value Id, and outputs the resultant value of the addition as a solenoid current instruction value SI, and changes the standby current instruction value Is on the basis of the vehicle speed.

Provision of a power steering system which is capable of preventing a delay in response for outputting a solenoid current instruction value SI. A controller C stores a table of basic current instruction values I corresponding to combinations of steering angles and steering angular velocities. The controller C obtains a basic current instruction value I from the table, and multiplies the obtained basic current instruction value I by a current instruction value I determined on the basis of a vehicle speed, and then determines the multiplied value as a solenoid current instruction value SI.

For an energy-saving type control, a value of a control low rate QP controlled by a flow control valve V is closer to a value of a flow rate required by an output side such as a power cylinder a steering valve or the like, to suppress a driving torque of a pump P. An excitation current I of a solenoid SOL is specified on the basis of a solenoid current instruction value I based on a steering torque and a solenoid current instruction value I defining a standby flow rate.

Power steering

For an energy-saving type control, a value of a control low rate QP controlled by a flow control valve V is closer to a value of a flow rate required by an output side such as a power cylinder , a steering valve or the like, to suppress a driving torque of a pump P. An excitation current I of a solenoid SOL is specified on the basis of a solenoid current instruction value I based on a steering torque and a solenoid current instruction value I defining a standby flow rate.

In a computer network system comprising a plurality of computers connected to a communication line, each computer executes a program including a function. In one of the computers, a judging section is supplied with a request indicative of the function from the program and judges whether or not the function can be executed by the above-mentioned one to produce a non-executable signal when the function cannot be executed by the above-mentioned one. Responsive to the non-executable signal, a request command generating section generates an original request command which is transmitted to at least one other computer as a transmission request command by a command transmitting section. A command receiving section of the other computer receives the transmission request command as a received request command, which an executing section executes to produce an execution result generated by a reply command generating section as an original reply command transmitted by the command transmitting section as a transmission reply command back to the above-mentioned one. The command receiving section of the above-mentioned one receives the transmission reply command as a received reply command which is returned to the program as the execution result by a returning section.

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Tokyo, Japan

Noboru Shimizu